C# 空闲时间后隐藏鼠标光标

Hide mouse cursor after an idle time

提问by SuperTux

I want to hide my mouse cursor after an idle time and it will be showed up when I move the mouse. I tried to use a timer but it didn't work well. Can anybody help me? Please!

我想在空闲时间后隐藏我的鼠标光标，当我移动鼠标时它会显示出来。我尝试使用计时器，但效果不佳。有谁能够帮助我？请！

采纳答案by Erich Mirabal

Here is a contrived example of how to do it. You probably had some missing logic that was overriding the cursor's visibility:

这是如何做到这一点的人为示例。您可能缺少一些覆盖光标可见性的逻辑：

public partial class Form1 : Form
{
    public TimeSpan TimeoutToHide { get; private set; }
    public DateTime LastMouseMove { get; private set; }
    public bool IsHidden { get; private set; }

    public Form1()
    {
        InitializeComponent();
        TimeoutToHide = TimeSpan.FromSeconds(5);
        this.MouseMove += new MouseEventHandler(Form1_MouseMove);
    }

    void Form1_MouseMove(object sender, MouseEventArgs e)
    {
        LastMouseMove = DateTime.Now;

        if (IsHidden) 
        { 
            Cursor.Show(); 
            IsHidden = false; 
        }
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        TimeSpan elaped = DateTime.Now - LastMouseMove;
        if (elaped >= TimeoutToHide && !IsHidden)
        {
            Cursor.Hide();
            IsHidden = true;
        }
    }
}

回答by Samuel

If you are using WinForms and will only deploy on Windows machines then it's quite easy to use user32 GetLastInputInfoto handle both mouse and keyboard idling.

如果您使用的是 WinForms 并且只会部署在 Windows 机器上，那么它很容易user32 GetLastInputInfo用来处理鼠标和键盘空闲。

public static class User32Interop
{
  public static TimeSpan GetLastInput()
  {
    var plii = new LASTINPUTINFO();
    plii.cbSize = (uint)Marshal.SizeOf(plii);

    if (GetLastInputInfo(ref plii))
      return TimeSpan.FromMilliseconds(Environment.TickCount - plii.dwTime);
    else
      throw new Win32Exception(Marshal.GetLastWin32Error());
  }

  [DllImport("user32.dll", SetLastError = true)]
  static extern bool GetLastInputInfo(ref LASTINPUTINFO plii);

  struct LASTINPUTINFO
  {
    public uint cbSize;
    public uint dwTime;
  }
}

And then in your Form

然后在你的 Form

public partial class MyForm : Form
{
  Timer activityTimer = new Timer();
  TimeSpan activityThreshold = TimeSpan.FromMinutes(2);
  bool cursorHidden = false;

  public Form1()
  {
    InitializeComponent();

    activityTimer.Tick += activityWorker_Tick;
    activityTimer.Interval = 100;
    activityTimer.Enabled = true;
  }

  void activityWorker_Tick(object sender, EventArgs e)
  {
    bool shouldHide = User32Interop.GetLastInput() > activityThreshold;
    if (cursorHidden != shouldHide)
    {
      if (shouldHide)
        Cursor.Hide();
      else
        Cursor.Show();

      cursorHidden = shouldHide;
    }
  }
}

回答by mikesl

Need to account for Environment.Tickcount being negative:

需要考虑 Environment.Tickcount 为负：

public static class User32Interop
{

    public static TimeSpan GetLastInput()
    {
        var plii = new LASTINPUTINFO();
        plii.cbSize = (uint)Marshal.SizeOf(plii);

        if (GetLastInputInfo(ref plii))
        {
            int idleTime = unchecked(Environment.TickCount - (int)plii.dwTime);
            return TimeSpan.FromMilliseconds(idleTime);
        }
        else
            throw new Win32Exception(Marshal.GetLastWin32Error());
    }

    [DllImport("user32.dll", SetLastError = true)]
    static extern bool GetLastInputInfo(ref LASTINPUTINFO plii);

    struct LASTINPUTINFO
    {
        public uint cbSize;
        public uint dwTime;
    }
}